Marker pen



FIG. 1 is a perspective view of a marker pen showing my new design;

FIG. 2 is a side elevational view, all other sides being identical thereto;

FIG. 3 is an end view from the marker tip end of the marker pen;

FIG. 4 is an end view from the rear end thereof;

FIG. 5 is a perspective view of an alternative embodiment of the marker pen, with a transparent barrel; and,

FIG. 6 is a perspective view with the tip cover mounted on the rear end of the marker pen. 

The ornamental design for a marker pen, as shown and described. 